Belts, impellers, spare filters for everything, for me 15 & 22mm plumbing connectors, duckbill valves...If I went down to the boat and went thru my storages I'm sure I could make this list quite lengthy... We'll spend 2-3 weeks on the boat in Canada with no marine store anywhere in site. It really depends on your cruising habits & location of spare part availability...

Belts, impellers, spare filters for everything, for me 15 & 22mm plumbing connectors, duckbill valves...If I went down to the boat and went thru my storages I'm sure I could make this list quite lengthy... We'll spend 2-3 weeks on the boat in Canada with no marine store anywhere in site. It really depends on your cruising habits & location of spare part availability...

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Thanks - forgot about the fan belts and duckbill. Always carried them on my last boat.

Along with the other things mentioned I always keep spare fuses, a 12 volt test light, some 12 volt connectors and a spare float switch. I’ve never had a bilge pump go bad on me but I have had to swap out float switches several times over the years and a couple of the times were when I was on a trip at a transient dock when a shower sump float switch went bad. Having a spare float switch really came in handy.

Agree with the above. A spare impeller and spare belts can be very helpful if you ever need them. I had a belt break and in 10 minutes I was up at full speed capability. Limping in one one engine is better than being fully disabled but still can make for a slow journey. Fuel filter also.

Best way to figure out what you need is to buy 2 of every thing you or a mechanic replaces or repairs. A 200 piece tool kit you get at NAPA or other store for $200. Sit in engine area and look at things and think of what could break and what you can run without if it breaks. We have a raw water pump as a spare because I had one fail when we were 20 knots from a port in rough water and ran it until we got to port. We had a starter fail once but never got a spare as I figure they should last a long time. I had both rebuilt a few years ago.